Preliminary Design of a Block-Coil Magnet for the Muon Collider Ring

In the framework of the IMCC (International Muon Collider Collaboration), a feasibility study for a collider ring 10 km long with muons having a center of mass energy of 10 TeV is currently being carried out. The superconducting magnets represent one of the most challenging components of the collider stage of such a facility: indeed, the need for high fields, large apertures and dipole + quadrupole combined function require technological choices at the edge of the status of the art. These requirements arise from the short lifetime at rest of the muons, 2.2 $\mu \text {s}$, which brings the need for a compact collider to maximize the luminosity and large bore magnets to accommodate adequate shielding for the decay products. Furthermore, long straight sections must be avoided to mitigate the dose hazard induced by the collimated neutrino beams produced by the muon decay, hence dipoles and quadrupoles must be combined in the same magnets. In this contribution we will present the preliminary 2D design of a superconducting magnet based on the block-coil concept that meets the requirements needed for the muon collider ring, focusing both on the electromagnetic and mechanical aspects.